Applied Mechanics and Materials Vols. 121-126

Abstract: Finding the right abandoned well (or new drilling ) leakage layer reinjection into the ground is the most effective, the most mature, the most commonly used method in the gas filed water treatment. By simplifying assumptions and the establishment of mathematical model and FEM, simulation and calculation of stress status of the tubing and casing, Analysis of wellbore integrity, for the analysis of the wellbore risk of gas field water reinjection wells and reinjection wells safety operation provide important theoretical support.

Abstract: Experiments were implemented on a prototype commercial liquid ejector to measure its hydraulic efficiency and the change of which along with a certain range of water flow rate variation was also recorded. Based on theoretical analysis and numerical simulation methods, we improved the ejector’s structure by modifying the suction part of it. Four ameliorated ejector structures, with increased pumping power and reduced flow resistance compared to the prototype, are proposed. Under the same working flow rate condition, flow field computations were conducted on the prototype and the four improved structures. The computational results show that the pumping power increases by 75.97%, the drag coefficient reduces 0.0908, the maximum turbulent energy dissipation rate decreases by 38.88% and the absolute value of the efficiency increases by 13.66%. The work validates the correctness of the theoretical analysis about the mechanism of energy-saving and efficiency enhancement for fluid ejector, and provides a more effective method to improve the performance of liquid ejector.

Abstract: In order to overcome the difficulty in selecting parameters of support vector machine (SVM) when modeling the PT fuel system fault diagnosis, SVM optimized by particle swarm optimization (PSO) algorithm was proposed. The PSO-SVM model was established and the fault multi-classifiers of the SVM were got. The pressure signal of the PT fuel inlet and outlet at different rotational speed and conditions was collected. The algorithm of PSO-SVM was used to train and recognize the pressure signal. The result of experiment confirms the validity of this method through comparison of the BP-NN, SVM and the PSO-SVM.

Abstract: To clean the spilled oil from wreck ships and protect the marine ecological balance and prevent the damage to marine environment, the simulation of oil spill in deep water with the wave motion, wind and current was built in FLUENT platform. The dispersion and diffusion of oil spill in deep water was simulated dynamically. Also the oil spilling trajectories under the conditions of different current velocities, wavelengths and wind velocities were compared and analyzed, respectively. The results showed that the current, wind and wave decided the location and areas of oil films on the sea surface. The water depth influenced by the wave which increased with the increasing wavelength. Meantime, the areas of oil films on sea surface increased with current velocity decreasing, while the distance between the oil film and the source of oil increased. With the wind velocity increasing, the extended length of oil dispersion underwater and the oil film area on surface increased.

Abstract: In this paper, ZnO nanorod film has been constructed on the OLED emission surface to investigate its light-extraction enhancement effect. Similar to the ZnO nanorods film obtained experimentally by chemical bath method, the modeled ZnO nanorod film is also granted the randomly distribution characteristics. Major attention is paid to study the effect of the orientation of the ZnO nanorods on enhancement degree of light extraction. FDTD simulations indicate that the ZnO nanorods with a randomly oblique alignment can make more light extracted outside the chip compared to the ZnO nanorods possessing the rigorously vertical alignment. This conclusion shows that excessive requirement for excellent alignment of ZnO nanorods does not make any sense in optimization of OLED light emission. This makes optimization of light emission of LED by ZnO nanorods prepared through liquid-phase method much easier to implement.

Abstract: The condensate gas reservoir of paraffin in Dalaoba is a kind of special and complex gas reservoir.High content of paraffin for condensate gas reservoir in Dalaoba and the deposition of paraffin seriously affect the production and safety to bring about greater economic loss.The method with combination of laser method and on-line filtering method for PVT high-pressure physical property shall be employed,and the simulated deposition method for paraffin precipitation phase state shall be established,therefore,the deviation between the simulated prediction results and experimental value for the paraffin precipitation point in Dalaoba is between 0.2°C~3.5°C to meet the precision requirement on engineering computation.

Abstract: In this paper, a 2-DOF planar parallel manipulator actuated horizontally by linear actuators is proposed. The inverse and forward kinematics can be described in closed form. The velocity equation, singularity of the manipulator and the conditioning index is investigated. In addition, the inverse dynamics problem of the device is investigated employing the Lagrange approach. The dynamic simulation is carried out. The results show that the kinematics performance and the force transmissibility are worse when the end-effecter moves near the singularity. The proposed manipulator can be applied to the field of machine tools or used as the mobile base for a spatial manipulator. The results of the paper are very useful for the design and application of the new manipulator.

Abstract: A friendly environmental wood adhesive was prepared using wild acorn starch as a raw material. The physical properties of wild acorn starch were investigated by scanning electron microscope (SEM) and brookfield viscometer. The polyvinyl acetate emulsion and isocyanate were employed to prepared modified wild acorn starch adhesives. The plywoods were prepared using the adhesives and their bonding strength was measured. The experimental results showed that 1) the wild corn starch was adaptive for preparing adhesive; 2)the optimum preparing conditions of the modified wild acorn starch adhesive were as follows: the mass ratio of acorn starch/water/modifing agent was 8/9/3, the addition amount of viscosity reducer was 0.6%, the mass proportion of polyvinyl acetate emulsion/starch adhesive was 1/1, the addition amount of isocyanate was 15% weight of starch adhesive. The plywood using the adhesive prepared at the optimum condition was 0.9 MPa, could meet the type ⅡChinese Strandard plywood requirement.

Abstract: Mine development can benefit mankind, but also cause ecological damage to the environment; bad influence threatens the lives and safety. Environmental pollution caused by mining is a complex; system changes, no single factor and the instantaneous direction indicators are not given the trend of the entire environmental system. Remote sensing data with regional and cyclical characteristics, using remote sensing technology to monitor the mine environment has a strong advantage, is one of the key people to study. By using time series remote sensing data, extraction mining environment-related indicators, and actual work to establish a complete index system and using AHP to determine weights, combined with comprehensive evaluation model of experimental area to study, and achieved good results.

Abstract: In the analysis of existing travel information service system of the main problems and travel information services on the basis of the relevant business processes, combining Service Oriented Architecture (SOA) the advantages. This paper proposes a method of travel information service system based on SOA overall design scheme. Its core content is SOA thought, as a theoretical guide in technical standard. The use of the existing AJAX, XML and Web Services, and other related technologies. For travel information services designed to service granularity. The scheme through a loose coupling, cross-platform system structure to reusing existing application system function module, easily incorporated into existing application systems to the new systems. Thus fully utilize existing resources.